✅ Add missing tests for code examples (#14569)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Nils-Hero Lindemann <nilsherolindemann@proton.me>

docs_src/graphql_/tutorial001_py39.py

@@ -0,0 +1,25 @@
+import strawberry
+from fastapi import FastAPI
+from strawberry.fastapi import GraphQLRouter
+
+
+@strawberry.type
+class User:
+    name: str
+    age: int
+
+
+@strawberry.type
+class Query:
+    @strawberry.field
+    def user(self) -> User:
+        return User(name="Patrick", age=100)
+
+
+schema = strawberry.Schema(query=Query)
+
+
+graphql_app = GraphQLRouter(schema)
+
+app = FastAPI()
+app.include_router(graphql_app, prefix="/graphql")